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Chapter 117: Looking for a Needle in a Haystack (3)

Due to the special environment of marine archaeology, researchers have modified the underground metal detector to make it work underwater, but the effect is much worse than that used on the ground. Pen, fun, pavilion www. biquge。 info

In fact, this thing looks very simple, it is the tip of a metal rod, enclosing a metal coil, and when it is surveyed against the seabed, as long as there is metal underneath, they can hear the alarm in the headset.

Of course, the error of this thing on the ground is about 20 percent, and the error on the bottom of the sea is even greater, which is not as magical as Zhuang Rui imagined.

After hearing Zhuang Rui's questioning, a diver retorted: "Mr. Zhuang, we have explored an area of more than 30 meters, but we have not found anything, maybe the silt layer is too deep, right?"

It has been more than half a century since the sinking of the Awa Maru, and after sixty or seventy years of sea washing, it is normal to accumulate more than ten meters of silt, and the diver's words made everyone nod slightly.

"Uh...... I don't blame you, but I mean, after all, the exact location of the sinking of the Awa Maru is already difficult to grasp, and now it is also based on the location of the last salvage, so I think you can expand the scope of the survey a little more, and maybe you will find something......"

Zhuang Rui couldn't name the first place where the gold was hidden, which was more than 200 meters away from the salvage ship, right? He couldn't explain it, so he could only suggest expanding the search area of divers.

"Alas, I knew that I was well prepared, and I brought the sonar device on the side to ......"

Professor Meng sighed, turned his face to look at Zhuang Rui, and said, "Xiao Zhuang, your ship is so advanced, and it is used for professional salvage, wouldn't it not be equipped with a side sonar system?"

"Teacher, there really isn't, otherwise, the Maritime Safety Bureau must have this object, and urgently call a set, right?"

Zhuang Rui smiled bitterly when he heard this, the side sonar system mentioned by Professor Meng, also known as "seabed scanning sonar", is an instrument device designed and manufactured to detect seabed landforms by using the principle of ultrasonic wave propagation and reflection in water.

Submarine scanning sonar consists of a transmitter, transducer, receiver, controller and recorder.

When a transducer mounted on the probe converts the supplied electrical energy into sound energy and emits a sound wave at a certain frequency to the seabed, the sound wave propagates rapidly into the sea water at a speed of 1,500 meters per second and scatters in a predetermined direction.

When the sound waves reach the seabed, because the topography of the seabed is undulating and diverse, some of the sound waves correspond to the shape, nature and high and low distance of the reflection point, forming waves with different strengths and speeds that are reflected back sequentially.

The improved seabed scanning sonar can have a special response to gold and silver materials, so this device is not only limited to marine geomorphological exploration, but can also be used for deep-sea archaeology.

However, Zhuang Rui has these eyes, and he has never thought that he can't find objects in the sea, so he didn't even want to install a submarine scanning sonar system on his luxury salvage ship.

Of course, this device is not a panacea, it only reacts to dense gold and silver materials, and if the Awa Maru wreck is more decomposed, even if it is equipped with a submarine scanning sonar, it is useless.

"There are in the bureau, but it will take at least two days to transport it from Beijing......

Director Wu agreed with Zhuang Rui's opinion, anyway, all the costs of this salvage will be borne by Zhuang Rui, and it doesn't matter if he stays for a few more days.

Zhuang Rui nodded and said, "Teacher, Director Wu, I think we still use a metal detector to detect while waiting for the sonar device, we can't be idle, right?"

Zhuang Rui's words made the divers of the Maritime Safety Bureau resentful, diving in the sea of dozens of meters is an extremely physically demanding thing, and diving for a long time will also have an impact on the chest and lung function, and it is easy to produce some occupational diseases.

There is no need for high technology, and they still enslave these divers, of course these brothers are not happy, but Zhuang Rui is the deputy commander of this salvage operation, even if it is named, it is not something that these staff can object.

"Well, what Xiao Zhuang said makes sense, let's expand the scope of the search and strive to find something as soon as possible......"

In an official tone, Director Wu was naturally familiar with the road, and anyway, he didn't want his old man to go into the water, so he nodded and agreed with Zhuang Rui's opinion.

Professor Meng returned to the salvage site more than 20 years ago, naturally wanting to find the wreckage of the Awa Maru as soon as possible, so he nodded and said: "Thank you for your hard work, the coordinates of more than 20 years ago will definitely change, let's expand the search range to about 100 meters......

Several leaders spoke, and although the divers were reluctant, they still put on their diving suits again, but to their consternation, Zhuang Rui actually asked for a set of diving equipment and put it on there.

Professor Meng also saw Zhuang Rui's actions at this time, and asked in some surprise, "Xiao Zhuang, ...... you What is this for?"

Diving requires professional training, especially deep-sea diving, where the water pressure at tens of meters is enough to kill people with no diving experience, so Professor Meng is very puzzled by Zhuang Rui's behavior.

"Teacher, I have experience in salvaging shipwrecks in the Song Dynasty, and I know more about the performance of ships on the bottom of the sea, so let's go down and have a look...... Zhuang Rui casually made an excuse.

"Hey, Xiaozhuang, this dive can only be carried out by professionals, don't fool around......"

Although Zhuang Rui's courage is commendable and his behavior is commendable, this is not a joke, especially since the sea floor is ever-changing, and danger may be encountered at any time.

"Teacher, it's okay, when I was looking for Pirate Island, I could dive to a depth of twenty or thirty meters with my bare hands, and this sea area is only more than forty meters, so there is no ......problem at all."

Zhuang Rui laughed when he heard this, now the record of freehand diving seems to be 105 meters, with Zhuang Rui's physique, I dare not say that it exceeds this record, but it is only a depth of thirty or forty meters, which is not challenging for Zhuang Rui at all.

What's more, there are also decompression diving suits and a series of diving equipment, Zhuang Rui really wants to go to the bottom of the sea to see the scenery, not to mention that if he doesn't go down, then I'm afraid he will really have to wait at sea for two days.

"Okay, then you have to be careful, if you feel any discomfort at the bottom of the sea, come back immediately......"

Professor Meng remembered what Zhuang Rui had done at sea, but he didn't doubt his words, and he didn't say anything at the moment, after all, with someone with rich archaeological experience accompanying the survey, the chances of finding the wreck would be much greater.

Seeing Zhuang Rui, the deputy commander-in-chief, diving and surveying with them, several divers did not complain, and after Zhuang Rui put on the diving suit, he taught Zhuang Rui how to use the thruster.

They used a single thruster, which can speed up the dive, this object is very easy to operate, Zhuang Rui listened to it once, and he knew about it.

"Husband, you have to be careful......"

Qin Xuanbing also heard the news that Zhuang Rui was going to the sea, and ran over with Fang Fangyuan, the storm that raged in the middle of the night yesterday really made Qin Xuanbing a little scared.

"Ahem, what's the matter, wife, the scenery under the sea is beautiful, or ...... Shall we go down together?"

Zhuang Rui didn't care, and suddenly let the glasses fall on the deck, just now I thought Zhuang Rui was noble, who knew that this guy was going to the bottom of the sea to tour the style?

"Stinky boy, this will be a joke......" Professor Meng scolded Zhuang Rui with a smile, and everyone reacted, dare to love Zhuang Rui This is to not worry his wife?

Knowing that Zhuang Rui was joking, Qin Xuanbing was not very nervous, and after telling Zhuang Rui a few more words, he watched Zhuang Rui go down the spiral ladder.

In fact, if you want to talk about the scenery, this sea area close to the coastline is really not very good, compared with the pirate island of that meeting, it is simply a world away, and in terms of water quality alone, there is no comparison between the two at all.

Going down to the sea with the thruster, Zhuang Rui grabbed the handle on the thruster, and after starting it, the propeller at the tail of the thruster rotated and sank to the bottom of the sea with Zhuang Rui.

There is an oxygen cylinder on his back, an oxygen mask on his face, and a walkie-talkie in his ears, except for the slight coolness when he goes down to a depth of more than 20 meters, Zhuang Rui does not have any uncomfortable reaction, which also makes the people guarding the monitor on the boat breathe a sigh of relief.

From the surface of the ocean to a depth of 200 meters, it is called the upper layer of the ocean in the terminology, in this range, sunlight can penetrate the seawater, from 200 meters to 1000 meters of the water layer, called the middle layer of the ocean, where the sunlight can not pass through all the seawater, the light is very weak, and the sea water is gray-blue.

The water layer from 1,000 to 4,000 meters is called the semi-deep layer, where no sunlight is perceived, and it is a dark world

Zhuang Rui and the others only dived to a depth of forty meters, and after reaching the bottom of the sea, even if they didn't need to turn on the strong lights, they could clearly see the surface of the seabed, but out of careful consideration, as soon as they reached the bottom of the sea, they turned on the headlights on the thrusters.

"Each person is responsible for the 50-meter range, and when you feel that there is not enough oxygen, you will immediately dive ......"

After seeing Zhuang Rui and the other five people go down to the bottom of the sea, the diving commander who was monitoring it gave orders to several people, because the oxygen consumption in the compressed air cylinder on each person's back was determined according to various reasons such as water pressure and depth.

Although several people use large bottles, at the bottom of the sea at forty meters, it can only last for about an hour at most, and when the oxygen is exhausted on the bottom of the sea, it is needless to say that it will take over.

"Understand ......"

After Zhuang Rui took the lead in agreeing, he made a gesture to the rest of the people, signaling the direction he wanted to investigate, and then used the thruster to turn and swam towards his target.

With the help of the thrusters, Zhuang Rui saved a lot of time, and after only a few minutes, he came to a place about 200 meters away from the cruise ship.